The current knowledge about potential risk factors for lymph node (LN) metastasis in patients with head and neck cutaneous squamous cell carcinoma (HNcSCC) is primarily based on studies that lack adjustment for confounding variables.
Both investigations lack adjustment for sun exposure or any other potential confounder.
The majority of studies are limited by design, include heterogeneous samples and lack adjustment for major confounding factors.
This might depend on the lacking adjustment for prognostic relevant parameters in comparative analyses between male and female cohorts.
Estimates among the 10 studies lacking adjustment for lead time bias and risk were mostly in the 30 to 54% range.
Many previous nonrandomized studies, however, have suffered from substantial methodological limitations, lacking adjustment for many potential confounders, active controls, incident-user designs, uniform follow-up, or intent-to-treat designs [ 10].
Concerning comparability, the second domain of quality assessment, a total of 21 studies lacked adjustment for demographic, lifestyle, or illness factors, such as the presence of comorbidity (5– 8, 11, 13, 15– 19, 21, 23, 28– 35).
Recently, an increased risk of cardiovascular events or death was documented in several observational studies; however, those studies were mainly retrospective studies (15, 16), lacked adjustment for important confounding factors (17, 18), had a short period of follow-up (19), or were based on the health administrative data without confirmation of cardiovascular outcomes (15, 18, 19).
Nevertheless, because mortality rates in our study among patients with non-027 type CDI strongly resembled mortality rates among patients with CDI caused by binary toxin negative isolates and because the Danish study was prone to bias and lacked adjustment for confounding, we think that the results of Bacci et al. (1 ) should be interpreted with caution.
Indeed, some judges have filed lawsuits to challenge the lack of adjustments to their salaries.
